Research Grade —
What That Actually Means

The Baseline: ≥98% Purity

Every peptide in the Helixera catalog is verified at ≥98% purity by HPLC before it ships. That number has a specific, testable meaning: at least 98% of what's in the vial is the target compound. The remaining ≤2% is accounted for — primarily water content and trace manufacturing residuals, not unknown impurities.

98% is the research-grade threshold that matters. Below it, impurities become a variable in your data. Above it, you have a clean tool.

Testing Methods Explained

HPLC — High-Performance Liquid Chromatography

HPLC separates a sample's components by passing them through a column under high pressure. Different molecules travel at different speeds — each appears as a distinct peak on the chromatogram. The area under the target peptide's peak, expressed as a percentage of total peak area, is the purity figure. This is the most reliable quantitative purity method available for peptides.

Mass Spectrometry (MS) — Identity Confirmation

Mass spectrometry measures the precise molecular weight of a compound. The measured mass is compared against the theoretical mass for the target peptide. A match confirms identity — you have what you ordered, not a similar compound or degradation product. MS is the definitive identity test.

Karl Fischer Titration — Water Content

Lyophilized peptides retain some residual water even after freeze-drying. The Karl Fischer test measures this precisely. Why it matters: if a vial contains 10% water by weight, a 5mg vial actually contains 4.5mg of peptide. We report water content on COAs so researchers can calculate actual peptide mass accurately.

LAL Endotoxin Testing

Endotoxins are fragments of bacterial cell walls that can trigger inflammatory responses. The Limulus Amebocyte Lysate (LAL) test detects endotoxins with extremely high sensitivity. All Helixera batches are confirmed below the endotoxin threshold required for research-grade material. This is particularly important for cell culture and in vivo research.

Residual Solvent Testing

Peptide synthesis uses organic solvents (DMF, DCM, acetonitrile) that must be removed before the product is suitable for research. Residual solvent testing by gas chromatography confirms that levels are below ICH Q3C limits — the international standard for acceptable solvent residues in pharmaceutical-grade compounds.

Third-Party Independence

All testing is performed by independent third-party laboratories — not in-house. This is a meaningful distinction. In-house testing creates an incentive to pass marginal batches. Third-party testing removes that incentive entirely: the lab has no commercial relationship with the outcome.

The batch number on your vial corresponds directly to the COA from the testing lab. You can request the COA for any batch you receive and verify the numbers yourself.

Supply Chain

We source exclusively from GMP-aligned synthesis facilities with documented quality management systems. GMP (Good Manufacturing Practice) alignment means the facility follows standardized procedures for synthesis, testing, documentation, and quality control — reducing batch-to-batch variability and minimizing contamination risk.

Every batch is tested upon receipt before it enters inventory. We don't ship product based on supplier certificates alone — we verify independently.

What We Don't Claim

We believe in being precise about what our standards mean — and equally precise about what they don't mean. ≥98% HPLC purity is a meaningful, verifiable number. "Pharmaceutical grade" without documentation is a marketing term. We use the former.